Array Louis Antoine Fauvelet de Bourrienne - The Collected Works of Napoleon Bonaparte

But this consequence resulted rather from the force of circumstances than from any absolute necessity; for Napoleon, by carrying his army to the other side of the Loire, might easily have formed a junction with the armies of the Alps and Pyrenees, and have reappeared on the field of battle at the head of a hundred thousand men. Such a force would have amply sufficed to re-establish the chances of war in his favor; more especially as the armies of the allied sovereigns were obliged to manœuvre upon the French territory with all the strong places of Italy and France in their rear.

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To direct operations with lines far removed from each other, and without communications, is to commit a fault which always gives birth to a second. The detached column has only its orders for the first day. Its operations on the following day depend upon what may have happened to the main body. Thus, this column either loses time upon emergency, in waiting for orders, or it will act without them, and at hazard. Let it therefore be held as a principle, that an army should always keep its columns so united as to prevent the enemy from passing between them with impunity. Whenever, for particular reasons, this principle is departed from, the detached corps should be independent in their operations. They should move toward a point fixed upon for their future junction. They should advance without hesitating, and without waiting for fresh orders; and every precaution should be taken to prevent an attack upon them in detail.

The Austrian army, commanded by Field-marshal Alvinzi, was divided into two corps, destined to act independently, until they should accomplish their junction before Mantua. The first of these corps, consisting of forty-five thousand men, was under the orders of Alvinzi. It was to debouch by Monte Baldo, upon the positions occupied by the French army on the Adige. The second corps, commanded by General Provéra, was destined to act upon the lower Adige, and to raise the blockade of Mantua. Napoleon, informed of the enemy’s movements, but not entirely comprehending his projects, confined himself to concentrating his masses, and giving orders to the troops to hold themselves in readiness to manœuvre. In the meantime, fresh information satisfied the general-in-chief of the French army that the corps which had debouched by La Coronna, over Monte Baldo, was endeavoring to form a junction with its cavalry and artillery—both which, having crossed the Adige at Dolce, were directing their march upon the plateau of Rivoli, by the great road leading by Incanole.

Napoleon immediately foresaw that, by having possession of the plateau, he should be able to prevent this junction, and obtain all the advantages of the initiative. He accordingly put his troops in motion, and at two o’clock in the morning occupied that important position. Once master of the point fixed upon for the junction of the Austrian columns, success followed all his dispositions. He repulsed every attack, made seven thousand prisoners, and took several standards and twelve pieces of cannon. At two o’clock in the afternoon, the battle of Rivoli was already gained, when Napoleon, learning that General Provéra had passed the Adige at Anghiari, and was directing his march upon Mantua, left to his generals the charge of following up the retreat of Alvinzi, and placed himself at the head of a division for the purpose of defeating the designs of Provéra.

By a rapid march, he again succeeded in the initiatory movement, and in preventing the garrison of Mantua from uniting its force with the relieving army. The corps intrusted with the blockade, eager to distinguish itself under the eyes of the conqueror of Rivoli, compelled the garrison to retire into the place, while the division of Victor, forgetting the fatigues of a forced march, rushed with impetuosity on the relieving army in front. At this moment a sortie from the lines of St. George took him in flank, while the corps of Augereau, which had followed the march of the Austrian general, attacked him in rear. Provéra, surrounded on all sides, capitulated. The result of these two battles cost the Austrians three thousand men in killed and wounded, twenty-two thousand prisoners, twenty-four standards, and forty-six pieces of cannon.

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An army ought to have only one line of operation. This should be preserved with care, and never abandoned but in the last extremity.

“The line of communication of an army,” says Montécuculli, “must be certain and well established, for every army that acts from a distant base, and is not careful to keep this line perfectly open, marches upon a precipice. It moves to certain ruin, as may be seen by an infinity of examples. In fact, if the road by which provisions, ammunition and reinforcements are to be brought up, is not entirely secured—if the magazines, the hospitals, the depôts of arms, and the places of supply are not fixed and commodiously situated—not only the army cannot keep the field, but it will be exposed to the greatest dangers.”

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The distances permitted between corps of an army upon the march must be governed by the localities, by circumstances, and by the object in view.

When an army moves at a distance from the enemy, the columns may be disposed along the road so as to favor the artillery and baggage. But when it is marching into action, the different corps must be formed in close columns in order of battle. The generals must take care that the heads of the columns, which are to attack together, do not outstep each other, and that in approaching the field of action they preserve the relative intervals required for deployment.

“The marches that are made preparatory to a battle require,” says Frederick, “the greatest precaution.” With this view, he recommends his generals to be particularly on their guard, and to reconnoitre the ground at successive distances, in order to secure the initiative by occupying those positions most calculated to favor an attack. On a retreat, it is the opinion of many generals that an army should concentrate its forces, and march in close columns if it is still strong enough to resume the offensive; for by this means it is easy to form the line when a favorable opportunity presents itself, either for holding the enemy in check or for attacking him if he is not in a situation to accept battle.

Such was Moreau’s retreat after the passage of the Adda by the Austro-Russian army. The French general, after having covered the evacuation of Milan, took up a position between the Po and the Tanaro.

His camp rested upon Alexandria and Valentia, two capital fortresses, and had the advantage of covering the roads to Turin and Savona, by which he could effect his retreat in case he was unable to accomplish a junction with the corps d’armee of Macdonald, who had been ordered to quit the kingdom of Naples, and hasten his march into Tuscany.

Forced to abandon his position in consequence of the insurrection in Piedmont and Tuscany, Moreau retired upon Asti, where he learned that his communication with the river of Genoa had just been cut off by the capture of Ceva. After several ineffectual attempts to retake this place, he saw that his only safety depended upon throwing himself into the mountains.

To effect this object, he directed the whole of his battering train and heavy baggage by the Col de Fenestrelle upon France; then opening himself a way over the St. Bernard, he gained Loano with his light artillery and the small proportion of field equipment he had been able to preserve.

By this skilful movement, he not only retained his communications with France, but was enabled to observe the motions of the army from Naples, and to facilitate his junction with it by directing the whole of his force upon the points necessary for that purpose.